Tài liệu Global Financial Management pdf

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Global Financial Management
Valuation of Stocks
Copyright 1999 by Alon Brav, Stephen Gray, Campbell R Harvey and Ernst Maug. All rights reserved. No part of
this lecture may be reproduced without the permission of the authors.
Latest Revision: August 23, 1999
3.0 Introduction
This lecture provides an overview of equity securities (stocks or shares). These securities provide
an ownership interest in the firm whereas debt securities (loans, bonds or other fixed-interest
securities) establish a creditor relationship with the firm. After a brief overview of some of the
institutional details of these securities, this module focuses on valuing equity securities by
making some simplifying assumptions. This leads us to a discussion of financial ratios that are
widely used in practice, in particular, dividend yields and price/earnings multiples. After
completing this module, you should be able to:
• Understand basic transactions involving stocks
• Demonstrate why stocks can always be valued as the present value of future dividends.
• Determine the value of a stock that pays a constant dividend
• Determine the value of a stock that pays a dividend that grows at a constant rate.
• Use the dividend growth model to infer the expected return on equity if you know the
expected growth rate of a company.
• Use the dividend growth model to infer the expected growth rate of future dividends for a
company where you know the expected rate of return on equity.
• Value a company using appropriate P/E-multiples and understand the limitations of this
methodology.
• Show how the value of a company can be decomposed into the value of growth options and
value of a constant earnings stream.
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3.1 Introduction to Stocks
Stocks represent an ownership interest in a company and confer three rights on the owner of a
share:
• Vote at company meetings: Shareholders vote on meetings on issues ranging from merger

proposals to changes in the corporate charter to the election of corporate directors.
• Collect periodic dividend payments. Unlike interest payments dividends are not
contractually fixed and can vary. Omission of dividends does not trigger bankruptcy.
• Sell the share at his or her discretion. In some countries this right can be limited.
In this lecture we focus on the valuation of stocks. Therefore, we are mainly concerned with the
second and third point. However, the first point is important for understanding the market for
corporate control and corporate governance.
Stocks are first issued to investors through what is known as the primary or new issues market.
Typically, companies are founded by one or few entrepreneurs and initially held by a small
number of investors. At some point the company decides to raise capital by offering shares to the
general public. This is known as an initial public offering (IPO). The company may decide to
raise more capital through selling shares in the future. These subsequent offerings are called
seasoned equity offerings (SEO). IPOs and SEOs together form the equity primary market. In
most cases companies enlist the help of an investment bank for conducting these offerings. The
bank handles the distribution of shares to investors. Sometimes they also provide companies with
a guarantee to sell a certain number of shares in exchange for a fee.
Investors purchase stocks for their returns. These returns come in the form of:
• capital gains - the appreciation in value over time, and
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• dividends - most companies pay periodic dividends.
Investors will be reluctant to purchase a stock unless there is a mechanism available for the
speedy resale of these stocks. This allows them to realize capital gains and to obtain liquidity
independently of the payout policy of the company. Provision of a resale mechanism is the
function of the stock exchange (also known as the secondary market). Investors are able to buy
and sell stocks through the stock exchange. Investors trade between themselves on these
exchanges. The company is not a party to the transaction and receives no funds as a result of
these transactions. Conversely, investors can liquidate their investments for consumption
purchases without forcing the company to liquidate investments. This feature of a secondary
market is crucial for economic development: companies can plan their investment policies
independently of the consumption patterns of their investors.

Various stock indexes are also maintained and are closely watched by investors. When we think
of how the stock market performed in a particular period, we invariably refer to one of these
indexes. The following tables give the major stock market indices and their values on November
24, 1997.
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Index Value 11/24/1997, 12:56pm EST
Dow Jones Industrial Average 7800.50
S&P 500 953.57
NASDAQ Combined Composite Index 1600.36
Toronto Stock Exchange 300 Index 6746.70
Mexico Bolsa Index 4721.97
Index Value 11/24/1997, 12:56pm EST
FT-SE 100 Index 4898.60
CAC 40 Index 2802.48
DAX Index 3830.63
IBEX 35 Index 6670.25
Milan MIB30 Index 22916.00
BEL20 Index 2357.44
Amsterdam Exchanges Index 875.46
Swiss Market Index 5645.70
Index Value 11/24/1997, 12:56pm EST
Nikkei 225 Index 16721.58
Hang Seng Stock Index 10586.36
ASX All Ordinaries Index 2482.10
These indices give some kind of average return for a particular market. A major difference
between stock indices is between equally weighted and value-weighted indices. Equally
weighted indices give the same weight to all stocks, independently of the size of a particular
company. Value-weighted indices use the market capitalization (the total value of all shares
outstanding) of each company.
3.2 Stock Transactions

There are three ways of transacting in stocks:
Buy - we believe that the stock will appreciate in value over time, or require the stock for its risk
characteristics as part of our portfolio (We are expecting a bullish market for the stock). It is also
said that we are long in the stock.
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Sell - we believe that the stock will depreciate in value over time or we require funds for another
purpose (liquidity selling).
Short Sell - here we do not own the stock, but we borrow it from another investor, sell it to a
third party, and, in theory, receive the proceeds. We are obligated to pass on to the lender of the
stock any dividends declared on the stock and also to pay to the lender the market price of the
stock if he himself should decide to sell. When we short sell, we believe that the stock will
decline in value thus enabling us to buy it back at a low price later on to make up our obligations
to the lender. We are expecting a bearish market for the stock. It is also said that we are short in
the stock.
When a short sale is executed, the brokerage firm must borrow the shorted security from its own
inventory or that of another institution. The borrowed security is then delivered to the purchaser
on the other side of the short-sale. The purchaser then receives dividends paid out by the
corporation. The short-seller must pay out any dividends declared by the firm to the original
owner from which the security was borrowed during the period in which the short-sale is
outstanding. To close out the short sale, the short seller must buy the stock in order to return the
security originally borrowed. Note that borrowing fees can be significant for “hard-to-borrow”
securities because these securities are in high demand due to a high level of short-selling (e.g.,
Netscape immediately after it went public).
In modeling finance problems we often assume that the investor receives the full proceeds of a
short sale. There are a number of practical mechanics, which limit the investors' ability to access
these funds. The proceeds from a short sale are usually held by an investor’s brokerage firm as
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collateral. The investor usually does not receive the interest from the short sale proceeds, and
will likely have to meet a margin requirement. In practice, short sales require a cash outlay. They
do not provide a cash inflow.

3.3 Valuation of Stocks
In this section, we determine the value of a typical stock. Assume that a stock has just paid a
dividend so that the series of future periodic dividends (D
t
) can be represented as:
Period
0 1 2 ... t …
Dividend
D
1
D
2
... D
t
…
We start by looking at a typical share traded on the stock exchange and bought and sold once a
year. The original buyer at t=0 buys the share with a view to sell it at the end of the first year at
an expected price of
1
P
. This entitles the investor to receive the first year's dividend
1
D
.
Assume the discount rate (= required rate of return) for this stock is constant and equal to r
e
.
Then the buyer values the share as:
0
11

e
P
=
D
+
P
1 + r
(1)
But what determines
1
P
? Simply assume the buyer in one year's time determines the price in
just the same way, and uses the same discount rate:
1
1
22
e
P
=
D
+
P
1 + r
(2)

1
The important assumption here is that the hypothetical investors concerned here use the same discount
rate. This is not a strong assumption. The assumption that discount rates are identical across periods
simplifies the analysis, but is not essential.
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Or, generally, for period T:
T - 1
TT
e
P
=
D
+
P
1 + r
(3)
Substituting equation (2) into equation (1) gives:
0
1
e
22
e
2
P
=
D
1 + r
+
D
+
P
(1 + r
)
(4)
Continuing the same process:

0
1
e
2
e
2
TT
e
T
P
=
D
1 + r
+
D
(1 + r
)
+ ... +
D
+
P
(1 + r
)
(5)
Since
(1 + r
)
e
T
becomes very large as T becomes very large, the expression

T
e
T
P
(1 + r
)
can be
neglected for a large time horizon.
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Hence:
0
1
e
2
e
2
3
e
3
P
=
D
1 + r
+
D
(1 + r
)
+
D
(1 + r

)
+ ...
(6)
This shows the first important result:

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Mathematically, this requires that P
T
does not grow "too fast" in some appropriate sense as T becomes
large.
The share price equals the present value of dividends.
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This formula is interesting in its own right because it shows that even though investors may turn
over their portfolios very frequently, this does not have any impact on the value of the stock:
short term investment horizons do not translate into a short termist valuation of shares.
However, in order to make use of expression (6), we have to make some assumptions about
future dividends. Before we turn to this topic, it is useful to turn to equation (1) once more and
express it in terms of returns. We solve for r
e
to find:
r =
D
P
+
P
-
P
P
e
1

0
10
0
(7)
The first part on the right hand side is commonly known as the dividend yield. This is a financial
ratio widely used by practitioners. However, note that in practice we do not know D
1
since it is
an expected value about a future dividend payment. Practitioners commonly refer to the dividend
yield as D
0
/P
0
. This difference is important and we shall therefore refer to D
0
/P
0
as the historic or
trailing dividend yield, and to D
1
/P
0
as the prospective dividend yield. The second part on the
right hand side of (7) is the capital gain, expressed as a percentage of the current stock price.
Then we can express (7) as:
3.4 The "Constant Growth" Formula
The simplest assumption about dividends is that they stay constant over time, so that
123
D
=

D
=
D
= .. = D. Then expression (6) simplifies to:
Return on equity
= Prospective Dividend Yield + Expected Capital Gain
9
0
e
e
0
P
=
D
r
r =
D
P
= DY⇒ (8)
where DY denotes the dividend yield. Hence, we have two important conclusions:
1.

If the dividend is expected to stay constant over time, shares can be valued like
perpetual bonds as P
0
=D/r
e
.
2. If the dividend is expected to stay constant, the expected return on equity is equal to the
dividend yield.

Unfortunately, constancy of dividends is a very specific assumption with little realism, and
therefore few applications. A more general assumption is that dividends grow at a constant rate.
Hence, assume that dividends grow at a constant rate g forever:
21
32 1
2
43 1
3
TT - 1 1
T - 1
D
=
D
(1 + g)

D
=
D
(1 + g) =
D
(1 + g
)

D
=
D
(1 + g) =
D
(1 + g
)

......

D
=
D
(1 + g) =
D
(1 + g
)
Substituting these expressions into (6) gives:
0
1
e
1
e
2
1
T - 1
e
T
P
=
D
1 + r
+
D
(1 + g)
(1 + r
)

+ ... +
D
(1 + g
)
(1 + r
)
+ ...
(9)
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Assume that g is smaller than r
e
.
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Then the general formula for adding this series is (see the
appendix for a derivation):
0
1
e
P
=
D
r - g
(10)
Note that (10) reduces to (8) if g=0, hence the constant dividend case is covered as a special
case. From this we can see immediately:
r =
D
P
+ g
e

1
0
(11)
This gives the third important result:
Using (7) together with (11) gives also:
()
g
PP
P
PgP=
−
⇔=+
10
0
10
1
(12)

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It turns out that g<r
e
is precisely the condition noted above to conclude that
()
T
e
T
r
P
+1
becomes small as T

becomes large. If g<r
e
, then
()
T
e
T
r
P
+1
would become infinitely large, hence we would have to conclude
that P
0
is infinitely large, hardly a plausible conclusion.
Expected Return on Equity
= Prospective Dividend Yield + Growth Rate
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Hence, if we assume that the company is in a steady state where dividends are expected to grow
at a constant rate g, we also expect that the stock price grows at the same rate constant rate g.
The strongest assumption we made in deriving (11) is the constancy of the growth rate, that is,
we assume the firm is in a "steady state". This is a strong assumption for any firm, but if we view
g as some kind of average we can sacrifice some generality for simplicity. However, for firms
which are clearly not in a steady state (consider firms where the current dividend and is zero, so
in the first year in which they pay a dividend the dividend growth will be infinity!), this
procedure is entirely inappropriate. In this case we have to extend the constant growth model and
define subperiods with different growth rates. Alternatively, we could formulate a model where
the dividend growth model holds for all periods after 3-5 years, and we use analysts’ dividend
forecasts for the first few years. This is illustrated in the following graph:
The graph illustrates exponential dividend growth, starting at a dividend of $1.00 in year 0. The
square-shaped points illustrate exponential growth (i. e., growth at a constant rate). The triangle

shaped points illustrate analyst’s forecast based on detailed projections fore the first 5 years.
0.00
0.50
1.00
1.50
2.00
2.50
13579111315
Grow th Path
Analyst Forecast
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3.5. Valuation of General Motors: an example
In order to see how these formulae may be applied, consider the case of General Motors. The
trailing (historic) dividend of GM in December 96 was $1.60 per share. Other data are:
Number of shares outstanding: 856,695,000
Market capitalization: $ 46.31bn
The market capitalization of a company is always defined as:
MCAP=Number of shares outstanding*Share price
Hence, we can use the apparatus we have built so far either on a per share basis (divide total
earnings, dividends and MCAP by the number of shares), or for the company as a whole. Suppose
you forecast that until the end of 1997 GM’s dividend will be $1.75 per share, and then grow at a
constant rate forever after. What valuation for GM do you obtain for alternative combinations of the
growth rate and the discount rate? The following table shows the type of results you obtain:
Table 1
Return/
Growth
3% 4% 4.50% 5% 6% 7%
7% 37.48 49.97 59.97 74.96 149.92 -
8% 29.98 37.48 42.83 49.97 74.96 149.92
9% 24.99 29.98 33.32 37.48 49.97 74.96

10% 21.42 24.99 27.26 29.98 37.48 49.97
11% 18.74 21.42 23.06 24.99 29.98 37.48
12% 16.66 18.74 19.99 21.42 24.99 29.98
In order to see how you obtain these results, consider the case of a 5% annual growth rate and 9%
return. (the boxed entry in the table). Our dividend per share forecast was $1.75. Multiplying this
with the number of shares outstanding gives a total expected dividend for GM for 1998 of $1.499bn,
or a prospective dividend yield of 3.78%. Then we have:
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bn
bn
gr
D
MCAP
GMGM
GM
48.37$
05.009.0
499.1$
1998
=
−
=
−
=
(13)
Hence, we can use the dividend growth model in order to value the equity of a company by using
the following steps:
1. Forecast the end of year dividend of the company
2. Estimate the growth rate of dividends and the required rate of return on capital
3. Use formula (10)

Conversely, we can also use the formula in the other versions discussed above in order to:
• Infer the growth rate of dividends: If you know the expected return on equity and the current
value, you can infer the growth rate (rearrange (10) or (11)) expected by the market. One way
of estimating expected returns is using another model for predicting required returns. We will
discuss one such model, the Capital Asset Pricing Model, in a subsequent lecture.
• Infer expected returns. If you know the growth rate of dividends (e. g., from industry
forecasts), you can infer the cost of equity capital used by the market.
3.6 Earnings yields and P/E ratios
The most widely used ratio are price earnings multiples, or short P/E multiples. Denote earnings
per share by
1
E
. Then the earnings yield is defined as
10
E
/
P
. It is therefore the reciprocal of
the P/E-ratio defined as
01
P
/
E
. Note that these are prospective P/E-ratios and earnings yields,
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and that financial analysts refer often to historic or trailing values, defined as
00
E
/
P

and
00
P
/
E
respectively. Dividends and earnings are related via the company’s payout policy. This
can be summarized in the payout ratio d defined as the ratio of dividends per share and earnings
per share:
d =
D
E
1
1
(14)
Then the dividend can be written as
11
D
= d
E
which can be substituted into (11) to give:
r =
E
P
*d + g
e
1
0
(15)
which relates to required return on equity to the earnings yield. Rearranging once more gives:
P

E
d
rg
e
0
1
=
−
(16)
This shows the result that:
If two companies have the same payout policy, the same cost of equity capital and the same
growth rate, then they should also have the same P/E ratio.
The problem with using the above measures is that they refer to prospective dividend and
earnings yields, whereas the financial press often reports historic yields. However, it is easy to
see that they can be related in a similar way by assuming that dividends and earnings grow at the
constant rate g from now on, i. e. that
10
D
=(1+g)
D
. If d is constant over time, this implies also
that
10
E
=(1+g)
E
. Then (11) and (15) and (16) become: